What number must be added toeach of the numbers 10, 18, 22, 38to make the numbers is proportion?
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Traditionally, the numbers are the same, in which case we solve
10+x18+x=22+x38+x⇒380+48x+x2=396+40x+x2⇒8x=16⇒x=210+x18+x=22+x38+x⇒380+48x+x2=396+40x+x2⇒8x=16⇒x=2 .
However, if you insist on numbers in plural, there are an infinite number of answers such as 30,22,18,030,22,18,0 .
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